Process of forming sheet-glass.



N5. 779,280. I v PATENTEDIJAYNS 1905. H. J, HAYS.

PROCESS OF FORMING SHEET GLASS. APPLIOATION FILED JUNE 17, 1903 batch is first heated to such a state as to make citizen of the United States of America, resid- 'avprocess whereby the molten glass is forced through a narrow slot for the purpose of form- UNITED STATES- Psoosss OF some;

SPEUIE'IG A' FION forming part of Letters latent 23o, r'23ii-, (155i;

SBURG,

Patented January 3, 1905.

PATENT PENN-Si Ur ENG Application filed June 17, 1903. Serial No. 161,783,

To all whom it may concern.-

Be it known that I, HARRY JAoon HAYS, a

ing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Processes of Forming Sheet-Glass, of which the following is a specification, reference being had therein to the accompanying drawing This invention relates to certain new and useful improvements in a process for forming sheet-glass, and relates more particularly to ing the same to a given gage.

The object of this invention is to provide a process whereby sheet-glass may be cheaply and efiectually formlad and at the same time to carry out the process in such a manner that the glass may be of uniform surface and with out blemish.

In describing the invention in detail reference will be had to the accompanying drawling, Showing one form of apparatus by means of which my improved process may be carried into effect.

The drawing shows a diagrammatical side elevation of an apparatus, partially in section, showing the sheet of glass being formed.

,To carry out my improved process,the glass the glass very pliable and is then placed in a pot 1. This pot is formed in two sections 3 4, heavily insulated from each other, anda cover 2, heavily insulated. from the sections 3 t, -The lower portions of the sections are contracted, so that the glass in passing through the outlet at the lower end of the pot will be gaged to the desired thickness. The glass is t'orced out of the pot under pressure, which may be accomplished byfa plunger operating through the cover of the pot, but generally and preferably accomplished by air-pressure, the air being led through the cover into the top of the pot through a suitable pipe 5, connected to any suitable source of air-supply, as 6, a valve 7 being interposed in the pipe 5 for controlling the amount of air admitted to the pot.

electrical current must pass in order to com-- plete the circuit.

' It is a well-known fact that glass when heated to a certain degreewiil act as a conductor, and in the present instance I find that in order to prevent the glass from varying in temperature to any great extent it is often necessary to increase or decrease the voltage, and to accomplish. thisI provide the variable resistance 11 in the circuit.

The sheet of glass formed by forcing the glass from the pot is received on a platform or table generally in the form of a car 12. In order that the glass when coming from the pot will not be marked or'disiigured by engagement with the table, the sheet is partially 1 respectively, interposed therein for the purpose of controlling the amount of air conducted to the nozzles.

In order that the glass in passing from the pot to the platform will not have to' be-given any undue bend, it is preferable to have the platform at an angle, as'shown, and for finally flattening and cooling the sheet of glass on the table or platform 1 project a blast of air against the sheet by connectinga pipe 19 with pipe 16, providing said pipe with a suitable nozzle 20 and controlling-valve 21.- l/Vhen a sheet of glass nearly the length of the table or platform has been formed, the glass is severed, and the plane upon which the car is then caused to travel \villbe such that-further movement the eof will bring it into position evenly and Without any undue chilling of the same.

It will be evident, of course, that in practicing the process various changes may be made in the form or arrangement of the apparatus without departing from the general spirit of the invention.

Having fully described my invention, What I claim as new, and desire to secure by Letters Patent. is'

1. The herein-described processof forming sheet-glass consistingin first electrically main tainingthe glass in a molten state, then formlng the glass to a predetermined gage under f air-pressure and partially cooling the same by currents of air blown against its opposing sides, and finallyin receiving one side of said glass on a support and subjecting the opposite side thereof to a current of airto flatten and cool the same.

2. The herein-describedprocess of forming shetglass consisting in electrically maintaining a pliable batch of glass in its pliable condition, employing a source of air-pressure to eject said glass tofor-m the same into sheets of a predetermined gage, employing air to partially cool the glass by contact with it opposing sides, passing the glass to a support, and flattening the glass by a blast of air projected against the glass while onthe support.

Intestimony whereof I aflix my signature in the presence. of two witnesses.

' -HARRY JACOB HAYS. Witnesses: i

GEO. B. RowLEY,

GEORGE M. SCHMIDT. 

